/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package net.inttes.lotura.binding.value;

/**
 * A value model that derives its value by applying some transformation to
 * one or more source value models. 
 * 
 * <p>Typical usage would be a type converter or string formatter.
 *  
 * @author Oliver Hutchison
 */
public interface DerivedValueModel extends ValueModel {

    /**
     * Returns an array of all values models that are used to derive 
     * the value represented by this value model.
     */
    ValueModel[] getSourceValueModels();
    
    /**
     * Returns true if the implementation does not support calls setValue.
     */
    boolean isReadOnly();
}